Welch Allyn 206EL Propaq Encore Vital Signs Monitor - User Manual - Manual (Page 33)

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Patient monitoring
ECG/RESP
Intended use–impedance pneumography (RESP)
The Respiration channel is intended to detect the rate or absence of respiratory effort,
deriving the signal by measuring the AC impedance between the selected terminals of
the ECG electrodes. RESP displays a respiration rate and waveforms. Two respiration lead
selections are available, Lead 1 (RA-LA) and Lead 2 (RA-LL).
WARNING Impedance pneumography detects respiratory effort via changes in
chest volume; therefore, impedance pneumography can be used to detect central
apnea. However, apnea episodes with continued respiratory effort, such as
obstructive apnea and mixed apnea, may go undetected. Always monitor and set
alarms for SpO
2
when using impedance pneumography to monitor respiratory
function.
WARNING With any monitor that detects respiratory effort via impedance
pneumography, artifact due to patient motion, apnea mattress shaking, or
electrocautery use may cause apnea episodes to go undetected. Always monitor
and set alarms for SpO
2
when using impedance pneumography to monitor
respiratory function.
WARNING The Propaq Encore automatically rejects cardiovascular artifact
(CVA). This function is dependent upon accurate ECG R-wave detection.
Therefore, always select the ECG lead with the most prominent QRS complex
when monitoring respiration via impedance pneumography.
WARNING Don’t place the Propaq Encore monitor with RESP in close proximity
with another respiration monitor because the RESP measurement frequencies
may interfere with one another.
WARNING Because pacemaker pulses in some instances may be falsely
counted as breaths, impedance pneumography is not recommended for use on
paced patients.
Note Impedance pneumography is not recommended for use with high frequency
ventilation.
Since RESP is derived from the same leads as the ECG channel, the Propaq
Encore determines which signals are cardiovascular artifact and which signals are
a result of respiratory effort. If the breath rate is within five percent of the heart
rate or a multiple or sub-multiple of the heart rate, the monitor may ignore breaths
and trigger an apnea alarm.